Molybdenum foil can be classified in multiple ways based on application, performance, and processing needs. First, by purity, it is divided into high-purity molybdenum (≥99.95%) and standard molybdenum (with minor impurities), with high-purity foil used in semiconductors and vacuum furnaces. Second, by processing method, categories include cold-rolled foil (high strength, hardness), hot-rolled foil (better toughness), and annealed foil (superior ductility); cold-rolled suits high-strength components, while annealed is ideal for forming. Third, by thickness, foil ranges from ultra-thin (<0.1 mm) to thicker (>1 mm), with ultra-thin used in electronics and thicker in structural parts. Fourth, by surface condition, options include polished foil (smooth, corrosion-resistant), acid-washed foil (clean surface), and unprocessed foil (cost-effective), with polished foil favored for precision equipment. Fifth, by application, categories include electronics foil (substrates, targets), high-temperature furnace foil (heating elements), and aerospace foil (heat-resistant parts). Additionally, by alloying, foil is classified as pure molybdenum or doped molybdenum (e.g., molybdenum-lanthanum, molybdenum-titanium alloys), with doped foil enhancing creep or oxidation resistance. Classification depends on application needs, with electronics prioritizing purity and surface quality, and high-temperature uses focusing on creep resistance and processability. In production, cost, performance, and environment must be balanced to select the appropriate foil type for specific applications.
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